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Novel hydroquinone-alumina composites stabilizing a guest-free clathrate structure: applications in gas processing

Coupan, Romuald and Moonen, Peter and Dicharry, Christophe and Plantier, Frédéric and Diaz, Joseph and Péré, Eve and Khoukh, Abdel and Guerton, Fabrice and Sénéchal, Pascale and Charvillat, Cédric and Solan, Marie-Line de and Torré, Jean-Philippe Novel hydroquinone-alumina composites stabilizing a guest-free clathrate structure: applications in gas processing. (2020) ACS Applied Materials and Interfaces, 12 (30). 34137-34147. ISSN 1944-8244

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Official URL: https://doi.org/10.1021/acsami.0c06187


Organic clathrates formed by hydroquinone (HQ) and gases such as CO2 and CH4 are solid supramolecular host–guest compounds in which the gaseous guest molecules are encaged in a host framework of HQ molecules. Not only are these inclusion compounds fascinating scientific curiosities but they can also be used in practical applications such as gas separation. However, the development and future use of clathrate-based processes will largely depend on the effectiveness of the reactive materials used. These materials should enable fast and selective enclathration and have a large gas storage capacity. This article discusses the properties and performance of a new composite material able to form gas clathrates with hydroquinone (HQ) deposited on alumina particles. Apart from the general characterization of the HQ-alumina composite, one of the most remarkable observations is the unexpected formation of a guest-free clathrate structure with long-term stability (>2 years) inside the composite. Interestingly enough, in addition to a slight improvement in the enclathration kinetics of pure CO2 compared to powdered HQ, preferential capture of CO2 molecules is observed when the HQ-alumina composite is exposed to an equimolar CO2/CH4 gas mixture. In terms of gas capture selectivity toward CO2, the performance of this new composite exceeds that of pure HQ and HQ-silica composites developed in a previous study, opening up new opportunities for the design and use of these novel materials for gas separation.

Item Type:Article
Additional Information:This is an open access article under the CC BY-NC-ND license : https://creativecommons.org/licenses/by-nc-nd/4.0/. Thanks to ACS editor. The definitive version of this document is available at: https://pubs.acs.org/doi/10.1021/acsami.0c06187
HAL Id:hal-02910839
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Total (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Laboratory name:
Deposited On:20 Nov 2020 09:51

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